Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism

Autores
Aragon, Eugenio; Gonzalez, Pablo Diego; AGUILERA, Emilia Yolanda; Cavarozzi, Claudia Ernestina; Llambias, Eduardo Jorge; Rivalenti, Giorgio
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Andesitas Alvar Formation is part of the large Jurassic volcanic province of Patagonia (southern South America) that, in Jurassic time, participated in the disassembling of Gondwana in a tensional-transtensional regime with large-scale half-grabens. This large igneous province contains alkaline and calc-alkaline series of andesite-trachyte, trachyte-rhyolite, and andesite-dacite trends. Four-phase experimental diagrams of Qz-Or-Ab-An and Ab-An-Ol-Di correlate with the TAS diagram and explain the Andesitas Alvar Formation's sodium-rich andesite-trachyte, which evolved through a thermal divide edge. This alkaline set initially included the paragenesis olivine-plagioclase-diopsidic augite, which was later replaced by hornblende-plagioclase-diopsidic augite. The andesite-trachyte trend is saturated in silica and rich in sodium and alumina. Diopsidic augite, plagioclase, and hornblende crystals are reverse zoned in magnesium, iron, calcium, and sodium, so the sodium-rich cores of plagioclase are not due to contamination, and the magmas mix several batches of partial melts of basic rock. Crystallization temperatures and pressures show that magma chamber emplacement and thermal reversal took place mainly at 4 kb. This is interpreted as the emplacement of collecting chambers at the brittle-ductile transition in the crust, where mixing and crystallization took place, followed by rapid extrusion in a transtensional tectonic environment. © 2003 Elsevier Ltd. All rights reserved.
Fil: Aragon, Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Gonzalez, Pablo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: AGUILERA, Emilia Yolanda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina
Fil: Cavarozzi, Claudia Ernestina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Llambias, Eduardo Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Rivalenti, Giorgio. Universita degli Studi di Modena; Italia
Materia
Alkaline
Andesite
Jurassic
Thermal Divide
Trachyte
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/75141
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/75141
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network_name_str CONICET Digital (CONICET)
spelling Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanismAragon, EugenioGonzalez, Pablo DiegoAGUILERA, Emilia YolandaCavarozzi, Claudia ErnestinaLlambias, Eduardo JorgeRivalenti, GiorgioAlkalineAndesiteJurassicThermal DivideTrachytehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Andesitas Alvar Formation is part of the large Jurassic volcanic province of Patagonia (southern South America) that, in Jurassic time, participated in the disassembling of Gondwana in a tensional-transtensional regime with large-scale half-grabens. This large igneous province contains alkaline and calc-alkaline series of andesite-trachyte, trachyte-rhyolite, and andesite-dacite trends. Four-phase experimental diagrams of Qz-Or-Ab-An and Ab-An-Ol-Di correlate with the TAS diagram and explain the Andesitas Alvar Formation's sodium-rich andesite-trachyte, which evolved through a thermal divide edge. This alkaline set initially included the paragenesis olivine-plagioclase-diopsidic augite, which was later replaced by hornblende-plagioclase-diopsidic augite. The andesite-trachyte trend is saturated in silica and rich in sodium and alumina. Diopsidic augite, plagioclase, and hornblende crystals are reverse zoned in magnesium, iron, calcium, and sodium, so the sodium-rich cores of plagioclase are not due to contamination, and the magmas mix several batches of partial melts of basic rock. Crystallization temperatures and pressures show that magma chamber emplacement and thermal reversal took place mainly at 4 kb. This is interpreted as the emplacement of collecting chambers at the brittle-ductile transition in the crust, where mixing and crystallization took place, followed by rapid extrusion in a transtensional tectonic environment. © 2003 Elsevier Ltd. All rights reserved.Fil: Aragon, Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Gonzalez, Pablo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: AGUILERA, Emilia Yolanda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; ArgentinaFil: Cavarozzi, Claudia Ernestina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Llambias, Eduardo Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Rivalenti, Giorgio. Universita degli Studi di Modena; ItaliaPergamon-Elsevier Science Ltd2003-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/75141Aragon, Eugenio; Gonzalez, Pablo Diego; AGUILERA, Emilia Yolanda; Cavarozzi, Claudia Ernestina; Llambias, Eduardo Jorge; et al.; Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 16; 3; 12-2003; 91-1030895-9811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/S0895-9811(03)00046-4info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981103000464info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:46:21Zoai:ri.conicet.gov.ar:11336/75141instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:46:21.953CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
title Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
spellingShingle Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
Aragon, Eugenio
Alkaline
Andesite
Jurassic
Thermal Divide
Trachyte
title_short Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
title_full Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
title_fullStr Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
title_full_unstemmed Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
title_sort Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
dc.creator.none.fl_str_mv Aragon, Eugenio
Gonzalez, Pablo Diego
AGUILERA, Emilia Yolanda
Cavarozzi, Claudia Ernestina
Llambias, Eduardo Jorge
Rivalenti, Giorgio
author Aragon, Eugenio
author_facet Aragon, Eugenio
Gonzalez, Pablo Diego
AGUILERA, Emilia Yolanda
Cavarozzi, Claudia Ernestina
Llambias, Eduardo Jorge
Rivalenti, Giorgio
author_role author
author2 Gonzalez, Pablo Diego
AGUILERA, Emilia Yolanda
Cavarozzi, Claudia Ernestina
Llambias, Eduardo Jorge
Rivalenti, Giorgio
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Alkaline
Andesite
Jurassic
Thermal Divide
Trachyte
topic Alkaline
Andesite
Jurassic
Thermal Divide
Trachyte
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Andesitas Alvar Formation is part of the large Jurassic volcanic province of Patagonia (southern South America) that, in Jurassic time, participated in the disassembling of Gondwana in a tensional-transtensional regime with large-scale half-grabens. This large igneous province contains alkaline and calc-alkaline series of andesite-trachyte, trachyte-rhyolite, and andesite-dacite trends. Four-phase experimental diagrams of Qz-Or-Ab-An and Ab-An-Ol-Di correlate with the TAS diagram and explain the Andesitas Alvar Formation's sodium-rich andesite-trachyte, which evolved through a thermal divide edge. This alkaline set initially included the paragenesis olivine-plagioclase-diopsidic augite, which was later replaced by hornblende-plagioclase-diopsidic augite. The andesite-trachyte trend is saturated in silica and rich in sodium and alumina. Diopsidic augite, plagioclase, and hornblende crystals are reverse zoned in magnesium, iron, calcium, and sodium, so the sodium-rich cores of plagioclase are not due to contamination, and the magmas mix several batches of partial melts of basic rock. Crystallization temperatures and pressures show that magma chamber emplacement and thermal reversal took place mainly at 4 kb. This is interpreted as the emplacement of collecting chambers at the brittle-ductile transition in the crust, where mixing and crystallization took place, followed by rapid extrusion in a transtensional tectonic environment. © 2003 Elsevier Ltd. All rights reserved.
Fil: Aragon, Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Gonzalez, Pablo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: AGUILERA, Emilia Yolanda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina
Fil: Cavarozzi, Claudia Ernestina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Llambias, Eduardo Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Rivalenti, Giorgio. Universita degli Studi di Modena; Italia
description The Andesitas Alvar Formation is part of the large Jurassic volcanic province of Patagonia (southern South America) that, in Jurassic time, participated in the disassembling of Gondwana in a tensional-transtensional regime with large-scale half-grabens. This large igneous province contains alkaline and calc-alkaline series of andesite-trachyte, trachyte-rhyolite, and andesite-dacite trends. Four-phase experimental diagrams of Qz-Or-Ab-An and Ab-An-Ol-Di correlate with the TAS diagram and explain the Andesitas Alvar Formation's sodium-rich andesite-trachyte, which evolved through a thermal divide edge. This alkaline set initially included the paragenesis olivine-plagioclase-diopsidic augite, which was later replaced by hornblende-plagioclase-diopsidic augite. The andesite-trachyte trend is saturated in silica and rich in sodium and alumina. Diopsidic augite, plagioclase, and hornblende crystals are reverse zoned in magnesium, iron, calcium, and sodium, so the sodium-rich cores of plagioclase are not due to contamination, and the magmas mix several batches of partial melts of basic rock. Crystallization temperatures and pressures show that magma chamber emplacement and thermal reversal took place mainly at 4 kb. This is interpreted as the emplacement of collecting chambers at the brittle-ductile transition in the crust, where mixing and crystallization took place, followed by rapid extrusion in a transtensional tectonic environment. © 2003 Elsevier Ltd. All rights reserved.
publishDate 2003
dc.date.none.fl_str_mv 2003-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/75141
Aragon, Eugenio; Gonzalez, Pablo Diego; AGUILERA, Emilia Yolanda; Cavarozzi, Claudia Ernestina; Llambias, Eduardo Jorge; et al.; Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 16; 3; 12-2003; 91-103
0895-9811
CONICET Digital
CONICET
url http://hdl.handle.net/11336/75141
identifier_str_mv Aragon, Eugenio; Gonzalez, Pablo Diego; AGUILERA, Emilia Yolanda; Cavarozzi, Claudia Ernestina; Llambias, Eduardo Jorge; et al.; Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 16; 3; 12-2003; 91-103
0895-9811
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/S0895-9811(03)00046-4
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981103000464
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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application/pdf
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dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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